It is found on Volvo Penta Inboard engines: AQD21B MD21BHis characteristics : Outside diameter: 77mm Diameter of the threaded part: 17mm Height: 120mm Inner diameter of the seal: 61mmIt is advisable to change the oil filter every year. This allows you to check the condition of your engine oil and to see if there is any anomaly. The 21549544 ensures optimal performance and durability. Designed for efficiency and longevity.